First slide

Ray optics

Question

A fly is sitting on the objective of a telescope. What will be its effect on the final image of the distant object?

Easy

A

Reduces
B

Increases
C

Remains constant
D

Indefinite

Solution

The fly will not be seen in the final image. But the intensity of the final image gets reduced because light will not enter the telescope from that part of the object where the fly is sitting. Therefore, a reduction effect will be observed in the final image of the fly.

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